Dollaseite-(Ce) Mineral Data

Dollaseite-(Ce) Mineral Data
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General Dollaseite-(Ce) Information

Help on Chemical Formula: Chemical Formula: CaCeMg2AlSi3O11(OH,F)2
Help on Composition: Composition: Molecular Weight = 551.04 gm
   Calcium     7.27 %  Ca   10.18 % CaO
   Cerium     25.43 %  Ce   29.78 % Ce2O3
   Magnesium   8.82 %  Mg   14.63 % MgO
   Aluminum    4.90 %  Al    9.25 % Al2O3
   Silicon    15.29 %  Si   32.71 % SiO2
   Hydrogen    0.27 %  H     2.45 % H2O
   Oxygen     36.29 %  O
   Fluorine    1.72 %  F     1.72 % F
                -   %   F    -0.73 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaCeMg2AlSi3O11(OH)1.5F0.5
Help on Environment: Environment: Metamorphic mineral with tremolite, norbergite and calcite.
Help on IMA Status: IMA Status: Approved IMA 1988 - Dana Number Modified from 58.2.1a.6
Help on Locality: Locality: Ostanmossa mine, Norberg district, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Wayne A. Dollase (1938-?), American mineralogist, University of California at Los Angeles.
Help on Name Pronunciation: Name Pronunciation: Dollaseite-(Ce) + Pronunciation Say DOLLASEITE-(CE)
Help on Synonym: Synonym: ICSD 202605
  Magnesium orthite
  PDF 41-1469
 

Dollaseite-(Ce) Image

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Dollaseite-(Ce)

Comments: Glassy brown crystalline grains of dollaseite-(Ce) in matrix.
Location: Ostanmossagruvan, Norberg, Sweden. Scale: Grain size 1 mm.
© Tom Loomis / Dakota Matrix

Dollaseite-(Ce) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.5616:1:1.7787
Help on Cell Dimensions: Cell Dimensions: a = 8.934, b = 5.721, c = 10.176, Z = 2; beta = 114.31° V = 473.99 Den(Calc)= 3.86
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.915(1), 2.709(0.7), 2.852(0.3),
Click Here for Large Dollaseite-(Ce) Structure Window Crystal Structure:

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Peacor D R , Dunn P J , American Mineralogist , 73 (1988) p.838-842, Dollaseite-(Ce) (Magnesium orthite redefined): Structure refinement and, implications for F + M2+ substitutions in epidote-group minerals, Note: Mg3-x coordinate has been corrected

 

Physical Properties of Dollaseite-(Ce)

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Brown.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Hardness: Hardness: 6.5-7 - Pyrite-Quartz
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light brown
 

Optical Properties of Dollaseite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.187,KC= 0.1899
Ncalc = 1.73
Help on Optical Data: Optical Data: Biaxial (?), a=1.715, b=1.718, g=1.733, bire=0.0180
 

Calculated Properties of Dollaseite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.68 gm/cc
note: Specific Gravity of Dollaseite-(Ce) =3.86 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEDollaseite-(Ce) = 124.89 barns/electron
U=PEDollaseite-(Ce) x relectron= 460.17 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 25,889.59 (Gamma Ray American Petroleum Institute Units)
Concentration of Dollaseite-(Ce) per GRapi unit = 38.63 (PPM)

Dollaseite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Dollaseite-(Ce) - weak
Specimen
Size
Weight/Volume
(Sphere) *		 Calculated
Activity
Bequerols
(Bq)		 Calculated
Activity
Curies (Ci)		 Estimated
Activity
GR(api)		 Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 7.91 cm 569,568 1.54E-05 25,889.59 8.51
100 gm / 3.67 cm 56,957 1.54E-06 2,588.96 0.85
10 gm / 1.70 cm 5,696 1.54E-07 258.90 0.09
1 gm / 7.91 mm 570 1.54E-08 25.89 0.01
0.1 gm / 3.67 mm 57 1.54E-09 2.59 0.00
0.01 gm / 1.70 mm 6 1.54E-10 0.26 0.00
0.001 gm / 0.79 mm 1 1.54E-11 0.03 0.00

Weight of pure Dollaseite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.86 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 1.27 % Th) From Sum REE Elements (25.43 % REE)
 

Dollaseite-(Ce) Classification
Help on Dana Class: Dana Class: 58.02.01d.01 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
  (58.02)with cations in [6] and higher coordination; single and double groups (n=1,2)
  (58.02.01d)Epidote group (Dollaseite subgroup)
 
58.02.01d.01 Dollaseite-(Ce) CaCeMg2AlSi3O11(OH,F)2 P 21/m 2/m
 
58.02.01d.02 Khristovite-(Ce) (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)MnAl(SiO4)(Si2O7)(OH)(F,O) P 21/m 2/m
Help on Strunz Class: Strunz Class: 09.BG.05c 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;
 
09.BG.05c Dollaseite-(Ce) CaCeMg2AlSi3O11(OH,F)2 P 21/m 2/m
 
09.BG.05c Khristovite-(Ce) (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)MnAl(SiO4)(Si2O7)(OH)(F,O) P 21/m 2/m
 

Other Dollaseite-(Ce) Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.73,p838-842,1988) OPTIC PROP.(Am.Min.,Vol.73,p838-842,1988)
Help on See Also: See Also: Links to other databases for Dollaseite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - MinMax(Deutsch)
9 - MinMax(English)
10 - Mineralienatlas (Deutsch)
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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Dollaseite-(Ce)

CaCeMg2AlSi3O11(OH,F)2
Dana No: 58.02.01d.01 Strunz No: 09.BG.05c
Locality:

 

Notes: